/* 
    定义圆角
    @radius 圆角大小
*/
.allcover {
  position: absolute;
  top: 0;
  right: 0;
}
.center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.cl {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.ct {
  position: absolute;
  left: 50%;
  transform: translateY(-50%);
}
